I recently took care of this myself. I had three entries that wouldn't go away. (4-5 seems like alot, however.. I'd make sure the locations point to the ex-Symantec folder if you haven't already.) Here's what I did to get rid of them.
*Uninstalled Symantec programs via Add/Remove
*Ran the removal program from Symantec's website
*Manually deleted Symantec folder
*Opened up services - stopped and disabled
*Regedit: MACHINE\System\CurrentControlSet\Services
Clicked on the first service to bring up information in the right panel, then used arrow key to scroll through entries to delete keys by location rather than name (because it didn't always match the one in Services)
*Restarted computer
And presto.. all gone! :grin:
*Uninstalled Symantec programs via Add/Remove
*Ran the removal program from Symantec's website
*Manually deleted Symantec folder
*Opened up services - stopped and disabled
*Regedit: MACHINE\System\CurrentControlSet\Services
Clicked on the first service to bring up information in the right panel, then used arrow key to scroll through entries to delete keys by location rather than name (because it didn't always match the one in Services)
*Restarted computer
And presto.. all gone! :grin: